I meet a strange problem recently which did not happen before. My acer E5-471g laptop could not boot up though the battery is full. I press the boot up button and nothing happens. And I unplug the battery and reset the BIOS. The laptop could boot up again! I am very confused. The default BIOS is UEFI, my laptop is legacy. My OS is Win7 64bits.
I think the problem is related to software. But I did not install strange apps recently.